#ppt {
    width: 100%;
    height: 500px;
    background-color: red;
    overflow: hidden;
    position: relative;
}

* {
    margin: 0;
    padding: 0;
    list-style: none;
}

.wrap {
    height: 170px;
    width: 490px;
    margin: 60px auto;
    overflow: hidden;
    position: relative;
    margin: 100px auto;
}

.ppt ul {
    position: absolute;
}

.ppt ul li {
    height: 500px;
}

.ppt ol {
    position: absolute;
    right: 500px;
    bottom: 10px;
}

.ppt ol li {
    height: 20px;
    width: 20px;
    background: #fff;
    border: 1px solid #fff;
    margin-left: 20px;
    color: #fff;
    float: left;
    line-height: center;
    text-align: center;
    cursor: pointer;
    border-radius: 50%;
}

.ppt ol .on {
    background: red;
    color: red;
}

#notice {
    width: 100%;
    height: 40px;
    background-color: #f2f1ef;
}

#notice #noticebtn {
    border: none;
    background-color: #f2f1ef;
    width: 100%;
    height: 40px;
    line-height: 40px;
    text-align: center;
}

#notice #noticebtn:hover {
    color: blueviolet;
}